lsm_c_area_sd: AREA_SD (class level)

Description Usage Arguments Details Value References See Also Examples

Description

Standard deviation of patch area (Area and edge metric)

Usage

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lsm_c_area_sd(landscape, directions)

## S3 method for class 'RasterLayer'
lsm_c_area_sd(landscape, directions = 8)

## S3 method for class 'RasterStack'
lsm_c_area_sd(landscape, directions = 8)

## S3 method for class 'RasterBrick'
lsm_c_area_sd(landscape, directions = 8)

## S3 method for class 'stars'
lsm_c_area_sd(landscape, directions = 8)

## S3 method for class 'list'
lsm_c_area_sd(landscape, directions = 8)

## S3 method for class 'stars'
lsm_c_division(landscape, directions = 8)

Arguments

landscape

Raster* Layer, Stack, Brick or a list of rasterLayers

directions

The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).

Details

AREA_{SD} = sd(AREA[patch_{ij}])

where AREA[patch_{ij}] is the area of each patch in hectares.

AREA_SD is an 'Area and Edge metric'. The metric summarises each class as the standard deviation of all patch areas belonging to class i. The metric describes the differences among patches of the same class i in the landscape.

Units

Hectares

Range

AREA_SD >= 0

Behaviour

Equals AREA_SD = 0 if all patches are identical in size. Increases, without limit, as the variation of patch areas increases.

Value

tibble

References

McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: http://www.umass.edu/landeco/research/fragstats/fragstats.html

See Also

lsm_p_area, sd,
lsm_c_area_mn, lsm_c_area_cv,
lsm_l_area_mn, lsm_l_area_sd, lsm_l_area_cv

Examples

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r-spatialecology/landscapemetrics documentation built on May 20, 2019, noon